NO308452B1 - Method for producing thin-walled bushings by injection molding a liquefied thermoplastic polymer having rigid rod-shaped molecules into a mold having a rotatable cylindrical center core - Google Patents

Method for producing thin-walled bushings by injection molding a liquefied thermoplastic polymer having rigid rod-shaped molecules into a mold having a rotatable cylindrical center core

Info

Publication number
NO308452B1
NO308452B1 NO944898A NO944898A NO308452B1 NO 308452 B1 NO308452 B1 NO 308452B1 NO 944898 A NO944898 A NO 944898A NO 944898 A NO944898 A NO 944898A NO 308452 B1 NO308452 B1 NO 308452B1
Authority
NO
Norway
Prior art keywords
mold
injection molding
thermoplastic polymer
center core
rigid rod
Prior art date
Application number
NO944898A
Other languages
Norwegian (no)
Other versions
NO944898L (en
NO944898D0 (en
Inventor
Etienne Aeppli
Original Assignee
Huber+Suhner Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huber+Suhner Ag filed Critical Huber+Suhner Ag
Publication of NO944898D0 publication Critical patent/NO944898D0/en
Publication of NO944898L publication Critical patent/NO944898L/en
Publication of NO308452B1 publication Critical patent/NO308452B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/5605—Rotatable mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0031—Movable mould wall parts in contact with weld lines, e.g. rotating pins for stirring the weld line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C2045/0098—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor shearing of the moulding material, e.g. for obtaining molecular orientation or reducing the viscosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0079—Liquid crystals

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Moulding By Coating Moulds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

In the case of liquid crystal polymers, on the one hand the rigid molecule chains and on the other hand possibly present fibrous reinforcing materials are aligned largely parallel to a weld line or flow line, with the result that the physical properties are lacking in the region of the weld line or flow line. It is an object of the invention to provide a possible way of preventing weld lines or flow lines from occurring in the first place. For this purpose, the liquidified material is subjected to a shearing energy from its entry into the injection mould, over at least part of the length of the workpiece. This shearing energy is produced by relative movement between two surfaces of the mould parts. <IMAGE>
NO944898A 1993-12-17 1994-12-16 Method for producing thin-walled bushings by injection molding a liquefied thermoplastic polymer having rigid rod-shaped molecules into a mold having a rotatable cylindrical center core NO308452B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH377893 1993-12-17

Publications (3)

Publication Number Publication Date
NO944898D0 NO944898D0 (en) 1994-12-16
NO944898L NO944898L (en) 1995-06-19
NO308452B1 true NO308452B1 (en) 2000-09-18

Family

ID=4263291

Family Applications (1)

Application Number Title Priority Date Filing Date
NO944898A NO308452B1 (en) 1993-12-17 1994-12-16 Method for producing thin-walled bushings by injection molding a liquefied thermoplastic polymer having rigid rod-shaped molecules into a mold having a rotatable cylindrical center core

Country Status (13)

Country Link
EP (1) EP0658412B1 (en)
JP (1) JPH07214596A (en)
CN (1) CN1065812C (en)
AT (1) ATE163590T1 (en)
BR (1) BR9404945A (en)
CA (1) CA2138221C (en)
DE (1) DE59405377D1 (en)
DK (1) DK0658412T3 (en)
ES (1) ES2114649T3 (en)
FI (1) FI106440B (en)
IL (1) IL111844A (en)
NO (1) NO308452B1 (en)
ZA (1) ZA949999B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19720430C2 (en) * 1997-05-15 2002-01-17 Bsh Bosch Siemens Hausgeraete Process and arrangement for injection molding to influence weld lines
CN106273319A (en) * 2016-10-13 2017-01-04 吕安民 A kind of Plastic Welding extruding machine
CN117183232A (en) * 2023-09-21 2023-12-08 中国华录·松下电子信息有限公司 A mold structure that solves the problem of local weld marks in injection molded products
CN118849316B (en) * 2024-09-25 2025-02-28 洛阳市建园模具制造有限公司 A special mold for high-frequency connector production

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1113559B (en) * 1959-07-31 1961-09-07 Ankerwerk Gebr Goller Process for the systematic control of the direction of orientation in the inner structure of parts made of thermoplastic material during their manufacture in injection molding machines
US3263274A (en) * 1963-03-14 1966-08-02 Beckman Instruments Inc High strength rotary member and method
CA1243462A (en) * 1984-12-21 1988-10-25 Peter S. Allan Moulding process
JPS63145007A (en) * 1986-12-09 1988-06-17 Matsushita Electric Ind Co Ltd Injection molding method
JPH0773860B2 (en) * 1990-05-10 1995-08-09 修 浜田 Molding die equipment

Also Published As

Publication number Publication date
ATE163590T1 (en) 1998-03-15
FI945938A0 (en) 1994-12-16
CN1065812C (en) 2001-05-16
DK0658412T3 (en) 1998-09-28
ZA949999B (en) 1995-08-22
EP0658412B1 (en) 1998-03-04
CA2138221C (en) 1999-05-04
ES2114649T3 (en) 1998-06-01
EP0658412A1 (en) 1995-06-21
IL111844A (en) 1998-12-06
NO944898L (en) 1995-06-19
DE59405377D1 (en) 1998-04-09
BR9404945A (en) 1995-08-08
FI945938L (en) 1995-06-18
JPH07214596A (en) 1995-08-15
CA2138221A1 (en) 1995-06-18
IL111844A0 (en) 1995-03-15
CN1110647A (en) 1995-10-25
NO944898D0 (en) 1994-12-16
FI106440B (en) 2001-02-15

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Free format text: LAPSED IN JUNE 2003